Repro Capsule MCP enables you to create, analyze, and execute safe, reproducible bug reproduction cases with mandatory review, secret redaction, and export capabilities.
Create and manage cases: Start a new case with an automatically redacted bug report; list all persisted cases and retrieve full details (profile, artifacts, analyses, runs).
Inspect the project: Dynamically discover project manifests, available commands, environment variable names, and Git state within the case's project root.
Analyze evidence: Generate evidence-cited hypotheses to answer specific questions about the bug.
Add artifacts: Attach reviewed project files as redacted text or hash-only binary records (no unreviewed binary content).
Plan and execute commands: Prepare exact non-shell command plans with one-time approval tokens, declaring network and workspace‑write intents; execute with bounded output, timeouts, process‑group cleanup, and output redaction before persisting.
Compare runs: Diff two recorded execution transcripts by exit status, expectation match, and output hashes.
Export capsule: Package all case metadata and reviewed artifacts into a portable ZIP with a versioned manifest and reproduction guide; no secrets or tokens included.
Security: Automatic redaction of secrets, strict denial of unlisted commands, separate approvals for network and workspace write, allowed‑roots enforcement, and force‑cleanup of process groups on timeout.
Click on "Install Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@Repro Capsule MCP start a case from this bug report"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
English | 한국어
Turn a bug report into a portable, reviewable reproduction capsule without silently copying a repository or executing model-generated shell text. Every report, command plan, transcript, artifact, and export stays evidence-linked and redacted.
flowchart LR
A[Bug report] --> B[Dynamic project profile]
B --> C[Evidence-based hypotheses]
B --> D[Reviewed command plan]
D --> E[One-time approval]
E --> F[Bounded execution]
C --> G[Portable capsule]
F --> GDynamic command discovery from current project manifests
Secret-redacted reports, text artifacts, stdout, and stderr
Binary artifacts represented by metadata and hashes instead of unreviewed content
Direct argv execution without a shell
One-time plan tokens with separate workspace-write and network approvals
Process-group timeout cleanup and bounded output capture
Run-to-run transcript comparison without guessing whether a fix is correct
ZIP export containing a versioned manifest and reproduction guide
Stdio and Streamable HTTP transports
Related MCP server: Docker MCP Server
uv tool install "git+https://github.com/efficjump/repro-capsule-mcp.git"
repro-capsule-mcp --transport stdioFor source development:
git clone https://github.com/efficjump/repro-capsule-mcp.git
cd repro-capsule-mcp
uv sync --all-extras --locked
uv run repro-capsule-mcp --transport stdio{
"mcpServers": {
"repro-capsule": {
"command": "repro-capsule-mcp",
"args": ["--transport", "stdio"]
}
}
}The installed command avoids embedding any local checkout path in client configuration.
Tool | Purpose |
| Create a bounded case with a redacted bug report |
| Browse persisted case state and evidence |
| Discover manifests, environment names, Git state, and commands |
| Produce host-model hypotheses from current evidence |
| Add reviewed text or hash-only binary evidence |
| Prepare an exact non-shell command and one-time token |
| Run one approved plan with bounds and redaction |
| Compare two execution transcripts |
| Create a portable ZIP and manifest |
Project roots must remain inside REPRO_CAPSULE_ALLOWED_ROOTS.
Sensitive filenames, symlinks, oversized files, and unreviewed binary content are excluded.
Commands not discovered from current project files are denied by default.
Network intent and workspace-write intent require separate approval.
Environment values and approval tokens are not written into capsule exports.
Every process uses a timeout, bounded output, and redaction before persistence.
This server is not an operating-system sandbox. Inspect and execute untrusted projects only in an isolated container or virtual machine.
repro-capsule-mcp --transport streamable-http --host 127.0.0.1 --port 8766The default endpoint is http://127.0.0.1:8766/mcp.
uv sync --all-extras --locked
uv run ruff format --check .
uv run ruff check .
uv run mypy src
uv run pytest --cov --cov-report=term-missing
uv buildSee architecture, security policy, and contribution guide.
Unclaimed servers have limited discoverability.
If you are the server author, to access and configure the admin panel.
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